Steam-generator.



2 Sheets-Sheet u,

Patented Mar. l 3, I900.

STEAM GENERATOR.

(Applgca-tien fil d Nov. 10, 1899.)

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EDWARD TIIOS. I-IANNAM AND JOHN A. BECl-ITEL, OF CINCINNATI, OHIO.

STEAM-G EN ERATQR.

SPEUIFICATION forming part of Letters Patent No. 645,090, dated March13, 1900. Application filed November 10, 1899. Serial No. 736,458. (Nomodel.)

To ctZZ whom it may concern: v

Be it known that we, EDWARD THOS. HAN- NAM and JOHN A. BECHTEL, citizensof the United States, residing at Cincinnati, in the county of Hamiltonand State of Ohio, have invented certain new and useful Improvements inSteam-Generators, of which the following is a specification.

The desirability of endowingsteam-generators with greatersteam-generating capacity in proportion to their size and fuelconsumption is obvious. There is also a well-recognized demand forefiective means of increasin g the efficiency of steam-generatorsalready in use Without reconstruction, increase of space, increase ofstack, increase of fuel consumption, or materialloss of time. It is theobject of our invention to accomplish these results; and our inventionconsists in novel means for increasing. the boiler circulation, novelmeans for increasing the heating-surface and the heating efficiency,novel means for supporting the boiler dead-plate, novel arrangements forcleaning the parts, and in the parts and combinations and arrangementsof a parts hereinafter described and claimed.

In the drawings, Figure l'is .a longitudinal section of asteam-generator embodying our invention; Fig. 2, an enlarged rear Viewcorresponding to Fig. 1, and Fig. 3 a partial longitudinal section of asteam-generator equipped with a modified form of our invention.

Arranged in the combustion-chamber A is a series of upwardly-extendingwater-tubes l3, communicating at their lower ends with manifold O and attheir upper ends with manifold D. The manifold C is provided with a pipe0, which taps the boiler E at a point near its bottoma little to oneside. The manifold D is provided with tubes d, tapping the boiler at alevel considerably higher than the pipe 0, and at points directlyopposite the openings of tubes B and d with removable plugs d and drespectively, which allow ready access for cleaning the tubes. The tubescl furnish a convenient supportfor a fire-brick or equivalent dead-headF, thus obviating the use of iron plates, which are quickly burned outand must be often renewed. The manifold D is mounted upon the top of therear wall of the combustion chamber, with plugs d and d exposed so as toallow ready access for'cleaning, for which purpose the upper surface ofthe wall is beveled at a. Both manifolds are provided with removableends 0 and 01 for cleaning purposes, and the lower one, C, with ablow-off c for frequent removal of deposits.

Owing to the preferred location of the tubes 13 in the area or beltwhere the flames and heated gases from the grate are drawn around theend of the boiler a portion of these heated products cross and recrossthe tubes, while another portion lick along a considerable portion oftheir length,thus affording a very thorough contact of the flames,&c.with the tubes,

and owing to the great pitchwhich is obtainable through this location ofthe tubes a very rapid circulation of boiler-water through them isobtained, and consequently a correspondingly large absorption of theheat from the products of combustion.

In the foregoing we have described a preferred form of arrangement, butthis may be modified almost indefinitely Without departing from thespirit of our invention-for instance, with those boilers alreadyprovided with a mud-drum the mud-drum may be very conveniently used inplace of the lower manifold O. This arrangementis indicated in Fig. 3,wherein 0 represents the mud-drum and c the pipe connecting it with thelower part of the boiler, the other parts being the same as before.Furthermore, the number, arrangement, and pitch of tubes B may be variedto suit the results desired. Thus the pitch may be varied from avertical position to any desired pitch, but it is thought that the pitchillustrated in Figs. 1 and 2 will prove most satisfactory for generalconditions of use.

l/Ve claim as'our invention 1. The combination in a steam-generator, ofa series of water-tubes inclinedupwardly and rearwardly through thecurved belt assumed by the products of combustion at the rear of theboiler; a connection between the tubes and a low point of the boiler;and one or more connections between the tubes and a high point of theboiler whereby water is taken from a low part of the boiler anddischarged into a higher part, substantially as and for the purpose setforth.

2. The combination in a steam-generator,

IOO

of a series of water-tubes arranged in the combustion-chamber andinclined upward from a position beneath the boiler to a position in therear of the boiler; a connection between the tubes and a low point ofthe boiler; and one or more connections between the tubes and a highpoint of the boiler whereby water is taken froma low part of the boilerand discharged into a higher part, substantially as and for the purposeset forth.

3. The combination in a steam-generator, of aseries ofupwardly-extending water-tubes arranged in the combustion-chamber; aconnection between the tubes and alow point of the boiler; one or moreconnections between the tubes and a high point of the boiler wherebywater is taken from a low part of the boiler and discharged into ahigher part; and a boiler dead-plate supported by the watertubes,substantially as and for the purpose set forth.

4. The combination in a steam-generator, of a water-drum in thecombustion-chamber below the boiler; a water-drum higher in thecombustion-chamber; a series of water-tubes connecting the drums; aconnection between the lower drum and alow point in the boiler; andpipes connecting the upper drum and a higher point in the boiler; and aboiler deadplate supported by the pipes, substantially as and for thepurpose set forth.

5. The combination in a steam-generator, of a water-drum in thecombustion-chamber below the boiler; a water-drum in a higher part ofthe combustion-chamber; a series of water-tubes connecting the drums; aconnection between, the lower drum and a low point in the boiler; one ormore connections between the upper drum and a higher point in the boilerwhereby water is taken from the lower part of the boiler and dischargedinto a higher part; and one or more openings in the upper drum throughwhich the tubes and pipes connected therewith may be cleaned,substantially as and for the purpose set forth.

6. The combination in a steam-generator,

of a water-drum in the lower part of the combustion-chamber andconnected with a low point of the boiler; a water-drum in a higher partof the combustion-chamber; a series of straight water-tubes connectingthe drums; one or more pipes connecting the upper drum with a high pointof the boiler; and one or more openings in the upper drum through whichthe pipes connected therewith may be cleaned, substantially as and forthe purpose set forth.

7. The combination in a steam-generator, of a water-drum in thecombustion-chamber below and connected with a low point of the boiler; awater-drum in a higher part of the combustion-chamber in the rear of theboiler; a series of straight water-tubes connecting the drums andpassing through the curved belt of products of combustion at the rear ofthe boiler; one or more pipes connecting the upper drum with a highpoint of the boiler; and one or more openings in the upper drum throughwhich the pipes connected therewith may be cleaned, substantially as andfor the purpose set forth.

8. The combination in a steam-generator, of'a water-drum in thecombustion-chamber below and connected with a low point of the boiler; awater-drum located at the top of the rear wall and partially outside ofthe combustion-chamber; a series of straight watertubes connecting thedrums and passing through the curved belt of products of combustion atthe rear of the boiler; one or more pipes connecting the upper drum witha high point of the boiler; a dead-plate supported by the pipesconnecting the upper drum with the boiler; and one or-more openings inthe exposed portions of the upperdrum whereby the pipes connectedtherewith may be cleaned, substantially as and for the purpose setforth.

EDW. THOS. HANNAM. JNO. A. BECHTEL.

Witnesses:

GEORGE E. PARKINSON, BRAYTON G. RICHARDS.

